Really? It sounds to me like they are relying on "motivation" which will inevitably wane. That's different than what I'm speaking to. Think about somebody who

Really? It sounds to me like they are relying on "motivation" which will inevitably wane. That's different than what I'm speaking to. Think about somebody who grinds out of a sense of duty (high on the "conscientiousness" scale of personality traits). They may not be motivated by the task itself, but are still able to continue the effort because of it's intrinsic rewards (for fueling their identity as a dutiful person, for example). A parent may not feel motivated all the time regarding doing "silly" activities with their children. But they can push forward anyways, because the idea of "being a good parent" is intrinsically rewarding.